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Published in Crop Sci 9:467-470 (1969)
© 1969 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Inheritance of Yield, Forage Quality and Seed Characteristics in Sericea Lespedeza1

W. A. Cope and R. H. Moll2

The inheritance of three forage quality characters, plant height, three yield characters, and two seed characters was studied in a cross between two inbred lines of sericea, Lespedeza cuneata (Dumont) G. Don. The design included F4 progenies from 3 F3 plants from each of 80 F2 plants and provided estimates of additive ({sigma}2A), dominance ({sigma}2D), and additive by additive ({sigma}2AA) variances.

Progeny means for tannin content of forage were bimodally distributed, indicating tannin content to be largely controlled by a partially dominant allele at a single locus. The {sigma}2A component was significantly large in eight of nine characters, {sigma}2D in two, and {sigma}2AA in none. For tannin and three yield traits {sigma}2D was large relative to total genetic variance, and inbreeding depression was noted for these traits. Thus, although inbreeding may be employed to enhance the efficiency of selection for chemical characteristics, it may be necessary to intercross several selected lines in the final stages of the improvement program to restore productivity.

Heritability estimates ranged from 45 to 88%, indicating opportunity for progress through selection in all nine characters.

Key Words: Genetic variance • Heterosis dominance • Apetalous-flower seed

1 Paper number 2772 of the Journal Series of the North Carolina State University Agricultural Experiment Station, Raleigh, North Carolina 27607, in cooperation with the Crops Research Division, Agricultural Research Service, U. S. Department of Agricultural.

2 Research Agronomist, Crops Research Division, ARS, USDA, and Associate Professor of Crop Science; and Professor of Genetics, North Carolina State University, Raleigh, N. C.

Received for publication January 4, 1969.




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